CN1209636C - Electronic paramagnetic resonance measurement scheme of personal radiation dose - Google Patents
Electronic paramagnetic resonance measurement scheme of personal radiation dose Download PDFInfo
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- CN1209636C CN1209636C CN 01134481 CN01134481A CN1209636C CN 1209636 C CN1209636 C CN 1209636C CN 01134481 CN01134481 CN 01134481 CN 01134481 A CN01134481 A CN 01134481A CN 1209636 C CN1209636 C CN 1209636C
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- magnetic field
- horizontal direction
- paramagnetic resonance
- radiation dose
- scanning
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Abstract
The present invention relates to an electronic paramagnetic resonance measurement scheme of a personal radiation dose. The scheme uses a horizontal working magnetic field and microwave working frequency of a x band; the magnet poles of a magnet are clamped on the outside of the face on both sides of the front gum of a person, and thus, supeaior teeth are bite into rectangular detection holes on a front end cap of a resonant cavity. The method can ensure that paramagnetic resonance is worked in a high sensibility state. The mouth cavity zone of the human body can be accommodated by the small magnet, and thus, high evenness desired by the paramagnetic resonance is reached by the magnetic field. The work efficiency of the magnetic field is raised, and the present invention is a feasible measurement scheme of the personal radiation dose in the human body.
Description
Technical field:
The present invention relates to a kind of technical method.Specifically, relate to and a kind ofly carry out personal radiation dose in the bulk measurement method with electron paramagnetic resonance.
Electron paramagnetic resonance (be called for short EPR or ESR) is to be used for containing in the test sample the not character of the paramagnetic material of coupling electronics and the technology of content.Many fields such as physics, chemistry, geology, material and biomedicine have been widely used in.Under isolated condition, detect tooth dosage with EPR and also be applied.
Background technology:
Personnel have an accident the dosage of ionising radiation when surpassing certain level, can cause the generation of radiation sickness.To effective medical treatment of this radiation sickness, depend on the early stage accurately measurement of the radiation dose that illuminated person is subjected to.Ionising radiation can be brought out paramagnets such as producing free radical in many tissues of human body.Especially the paramagnetic center that forms in tooth is highly stable.And its growing amount and radiation dose are linear.Carry out the radiation dose assessment so can utilize the concentration of paramagnetic material in the tooth glaze.
But detect people's tooth dosage with EPR at present, all under isolated condition, realize.This method needs tooth is taken off, and extracts the dental enamel powder end, puts into quartz ampoule, detects in sample cavity again.Because the difficulty of sampling makes its application be subjected to very big restriction.
Afterwards, Japan scholar Motoji Ikeya has proposed to utilize people's tooth to carry out imagination (M.Ikeya and H.Ishii Atomic Bomb and Accident Dosimetry With ESR:Natural Rocks andHuman Tooth In-vivo Spectrometer.Appl.Radiat.Isot., 1989 of radiation dose in body EPR measurement; 40 (10/12): 1021-1027.).But the scheme that he proposed is to utilize vertical direction magnetic field, and tooth is leaned against on the hole face in perforate chamber.Because of this method needs an end magnetic pole is placed in the oral cavity, be subjected to the restriction in space in the oral cavity, desire produces the required high strength of paramagnetic resonance and magnetic field is very difficult uniformly.And this imagination can only adopt one-sided coil to realize field scan.Can't obtain even scanning magnetic field.So actual enforcement difficulty is very big.So far, the scheme of Ikeya imagination fails to realize always.
Summary of the invention:
The purpose of this invention just provides a kind of feasible method of surveying in health check-up of personal radiation dose being carried out with electron paramagnetic resonance.
For realizing this purpose, the present invention has designed following scheme.
Adopting the x band microwave is frequency of operation.Adopt permanent magnetic material 2 to produce the constant magnetic field of horizontal direction, utilize the scanning magnetic field coil 3 on the yoke 4, produce the electromagnetic field scanning of horizontal direction.The paramagnetic resonance magnetic field that the resultant field of forming with permanent magnetism and electromagnetism produces horizontal direction jointly.Make two magnetic pole caps 5 be clipped in the outside of the anterior face of people's gum.Guaranteeing to hold under the prerequisite of the average gum width of adult, should make distance between two poles, and making the diameter of two magnetic pole caps as far as possible little, dwindling magnet volume, improving the purpose of magnetic field efficient to reach from as far as possible little.
It is frequency of operation that the present invention adopts the x band microwave.Therefore make the paramagnetic resonance detection sensitivity remain on best band, on sample detection resonator cavity end cap, open a rectangle and detect the hole, tested tooth is nipped detect in the hole, rather than lean against on the hole.Detection sensitivity is greatly improved.Owing to around detecting the hole, set up the high frequency modulated magnetic field of horizontal direction, so can adopt the permanent steady and scanning work magnetic field of horizontal direction, make magnet arrangement and field sweep mode all be easier to realize.In addition, the bilateral magnetic pole is stuck in gum both sides before the oral cavity, and head integral body need not be placed between magnetic pole, makes magnet size dwindle greatly, and is easy to guarantee the homogeneity range in magnetic field intensity and magnetic field.This method also can obtain uniform scanning magnetic field more easily.
The detection method that this invention is set up can realize detecting in the body paramagnetic resonance of human teeth's radiation dose.
Description of drawings:
Fig. 1. be the embodiment synoptic diagram of this invention.
1 is resonant cavity; 2 is permanent magnetic material; 3 is the scanning magnetic field coil; 4 is yoke; 5 is the magnetic pole cap.
Embodiment:
Further specify realization preferred version of the present invention below in conjunction with accompanying drawing
Frequency of operation is 9.5GHz.Test sample resonator cavity 1 is TE
111Type.Magnetic direction is a horizontal direction.The permanent steady magnetic induction density of setting up with permanent magnet 2 is 0.335 tesla.The scanning magnetic field of setting up with electromagnet 3 is that 0～0.015 tesla is adjustable.The spacing of two magnetic pole caps 5 is 90～110 millimeters.The diameter of magnetic pole cap 5 is not more than 80 millimeters.During detection, make both sides magnetic pole cap 5 just be stuck in the outside of the anterior face of people's gum, make labial teeth be positioned at how much central areas between two magnetic poles.Sting on the detection hole of resonant cavity 1 with upper tooth, need not take off tooth, just can realize measuring of people's tooth dosage at body EPR.
Claims (5)
1. the electron paramagnetic resonance of a personal radiation dose is in the bulk measurement method, this method is a frequency of operation with the x band microwave, the magnetic field of horizontal direction is work magnetic field, by the detection to paramagnet concentration in people's tooth glaze, realizes the measurement to personnel's ionizing radiation dose; It is characterized in that: described frequency of operation is 9.0～10.0GHz, described work magnetic field comprises constant magnetic field, scanning magnetic field, high frequency modulated magnetic field, wherein adopt permanent magnetic material (2) to produce the constant magnetic field of horizontal direction, utilize the scanning magnetic field of scanning magnetic field coil (3) the generation horizontal direction on the yoke (4), the paramagnetic resonance magnetic field that the resultant field that permanent magnetism and electromagnetism are formed produces horizontal direction jointly; During mensuration, make both sides magnetic pole caps (5) just be stuck in the outside of the anterior face of people's gum, make labial teeth be positioned at how much central areas between two magnetic poles, sting on the detection hole of resonant cavity (1) with upper tooth and carry out surveying in health check-up.
2. measuring method according to claim 1 is characterized in that distance is 90～110 millimeters between both sides magnetic pole caps (5).
3. measuring method according to claim 1 is characterized in that magnet magnetic pole cap (5) diameter is not more than 80 millimeters.
4. measuring method according to claim 1 is characterized in that the scanning magnetic field that only utilizes to be positioned at scanning magnetic field coil (3) the generation horizontal direction of yoke (4) lower central position.
5. measuring method according to claim 1, the resonant cavity (1) that it is characterized in that being used for test sample is TE
111Type is opened rectangle and is detected the hole on the top end cover of chamber, adopt horizontal direction high frequency modulated magnetic field on the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134481 CN1209636C (en) | 2001-11-06 | 2001-11-06 | Electronic paramagnetic resonance measurement scheme of personal radiation dose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134481 CN1209636C (en) | 2001-11-06 | 2001-11-06 | Electronic paramagnetic resonance measurement scheme of personal radiation dose |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1417572A CN1417572A (en) | 2003-05-14 |
| CN1209636C true CN1209636C (en) | 2005-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01134481 Expired - Fee Related CN1209636C (en) | 2001-11-06 | 2001-11-06 | Electronic paramagnetic resonance measurement scheme of personal radiation dose |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102657559B (en) * | 2012-04-26 | 2017-12-22 | 中国人民解放军军事医学科学院放射与辐射医学研究所 | For the electron paramagnetic resonance resonator in bulk measurement people's tooth |
| CN103033526B (en) * | 2013-01-05 | 2017-09-12 | 中国人民解放军军事医学科学院放射与辐射医学研究所 | A kind of cylindrical electron paramagnetic resonance probe of external sample measurement |
| CN103018269B (en) * | 2013-01-05 | 2017-09-12 | 中国人民解放军军事医学科学院放射与辐射医学研究所 | A kind of rectangle electron paramagnetic resonance probe of chamber external pelivimetry sample |
| US10722138B2 (en) | 2014-06-12 | 2020-07-28 | Technion Research & Development Foundation Limited | Method and system for electron paramagnetic resonance |
| US9986964B2 (en) * | 2015-03-10 | 2018-06-05 | Dental Imaging Technologies Corporation | Intraoral sensor position detection for full mouth image |
| US10161856B1 (en) * | 2018-01-19 | 2018-12-25 | Ping-Chieh Wu | Magneto-optical bio-detection devices having high sensitivity |
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2001
- 2001-11-06 CN CN 01134481 patent/CN1209636C/en not_active Expired - Fee Related
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| CN1417572A (en) | 2003-05-14 |
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